Since getting this CO2 meter, I’ve found there’s a high correlation with being unfocused and/or irritable with 800+ readings. Reminder to get some fresh air, open the window, etc.

Wow, super cool to see new metrics like that.

I don’t have numbers for it but another tip: if you find yourself very productive at a coffee house or library, often it’s the chair and desk they set up.

Sometimes if it’s good enough, you can just note down the brand and buy your own.

Copy the ergonomics.

Also considering a CGM for a month and weaning off of caffeine. Trying to reduce days were I feel like I'm dragging.

Maybe you know this, but optimal coffee intake is ~1-2 hours after waking up. If you take it too early, you’ll need a 2nd one soon after.

Maybe you know this, but optimal coffee intake is ~1-2 hours after waking up. If you take it too early, you’ll need a 2nd one soon after. 

https://www.betterup.com/blog/best-time-to-drink-coffee